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thread507-459807 I'd like to reboot one of my favorite threads on this forum -- the one where Kootk explains how structural engineering is a trade and that the way that our business models work is by keeping early-stage engineers in the dark about the economics. There's more to it, but that...

Red "Mud"...hmmm. http://www.bbc.com/news/world-latin-america-34742404 "We shape our buildings, thereafter they shape us." -WSC

See link: http://www.latimes.com/local/lanow/la-me-berkeley-balcony-collapse-20150616-story.html#page=1 "We shape our buildings, thereafter they shape us." -WSC

All- What has your experience been using metal structural insulated panels (SIP) for an industrial roof system? Advantages? Problems? I am considering using them on a 15,000 square foot, gabled roof industrial building. How well does the system resist temperature-induced movement? Do they stay...

How do pre-engineered wood truss engineers design the bottom chord? If the drawings specify that the bottom chord should carry an uniform load... does the design engineer assume that the hung load will be screwed into it? How does the industry approach this? "We shape our buildings, thereafter...

Does any one have a PDF copy of historic versions of ASTM A82? Specifically from 1932, but any near-by date would be helpful. Also, does anyone have any CSRI detailing guides from the 30's or 40's scanned in? I am assessing a 1940s one way concrete slab (with welded wire reinforcing draped...

I am trying to not to reach too far past this forum's purpose, but I often find while writing structural condition assessments that I am asked to provide a preliminary estimate on probably construction costs. How do other engineers prepare these estimates? I am familiar with RSMeans, but I am...

Many moons ago, the forum handled a question similar to this, but one item (described below) was left unresolved: http://eng-tips.com/viewthread.cfm?qid=279469 Say you have a 30' high precast concrete wall (say double T's). Say each wall panel is 8' wide. And say you want to put a 12' wide...

I have an 18' tall free standing sign (approx. 16' wide) being placed near (about 1' - 5' away) an existing building (about 14' tall). At what point does the free standing sign start to attract parapet type wind loads? Does ASCE provide any guidance? "We shape our buildings, thereafter they...

All, Assume you are designing an individual, non-perforated, wood shear wall. How do you calculate the holddown force for the chord members? It sounds like a simple question (and I'm sure there is a simple answer), but I am confused. I get into the sources of my confusion below (for this...

Hey All, I have a question regarding drifting snow and rooftop mechanical units. For discussion purposes, say I have three, 13' long x 5' wide RTUs that are going to be placed along the same column line on a flat roof. Since each unit is shorter than 15' feet, ASCE7-05 says that drift loads...

All, I was in a discussion with a Construction Manager acquaintance who graduated with a BS-Civil Engineering from an accredited university, is in his late fifties, and appears to be very knowledgeable and astute. He has heard that there is a new (well, since 2008) module on the PE-Civil exam...

All, I would like to become better aquainted with corrosion-related issues in reinforced concrete structures. Investigation strategies and techniques, as well as remedial repair products and methods. Can anyone suggest a book(s) or references that they have found useful? Note: I have the...

All- Could someone direct me to a link that explains the history / design defects known about this tower? I have always followed it from afar, but I would be interested in knowing more about it. http://www.lvrj.com/business/county-faulted-on-harmon-128659628.html Thanks, MJB "We shape our...

All, In Massachusetts, does anyone know whether passing the new 16-hour Structural Exam grants you the title SE or PE? MJB "We shape our buildings; thereafter they shape us." -WSC

All- I am designing a reinforced concrete retaining wall for a community pool. I am trying to understand the effects of chlorinated water on concrete and concrete reinforcement. A few questions: Is chlorine infiltration synonymous with chloride infiltration? Does chlorinated water have a...

All, We are looking designing a reinforced concrete pool. The walls will be cantilevered retaining walls and the floor will be a slab on grade. Should this structure be designed to the ACI318 or the more stringent ACI350 (Code Requirements for Enviromental Engineering Concrete Structures and...

All, We are replacing a small (18" tall) retaining wall for a Client and are wondering if it is required to sink the footing to the frost line (48"). The wall is about 10' long and simply retains soil along an exterior walk way. Our initial instinct is to design a standard cantilevered...

All- My firm is looking at a project which would require sophisticated 3D modeling / FEM analysis to be conducted. We are looking at the latest version of SolidWorks Simulation Premium (capable of performing static load / temperature analysis) for a cost of approximately $10k-$12k. To justify...

All, I am seeing that air entrained concrete has a higher R-Value than standard poured concrete (see below). Whereas it makes sense, the difference surprises me. Is air-entrained concrete really this good at insulating? Standard Concrete: R = 0.8 (F*h*sqft/BTU)/in Air Entrained...